package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.TimeoutUtils;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;

import javax.annotation.Resource;
import javax.swing.text.View;
import java.util.Collections;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{

    private final String name;
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true)+"-";
    private final StringRedisTemplate stringRedisTemplate;
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;

    static{
        UNLOCK_SCRIPT=new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        String id = ID_PREFIX+ Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, id + "", timeoutSec, TimeUnit.MINUTES);
        return BooleanUtil.isTrue(success);
    }
    @Override
    public void unlock() {
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX+name),ID_PREFIX+Thread.currentThread().getId());
    }

//    @Override
//    public void unlock() {
//        String id = ID_PREFIX + Thread.currentThread().getId();
//        String s = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if (s.equals(id)){
//            stringRedisTemplate.delete(KEY_PREFIX+name);
//        }
//    }
}
